JP5619583B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device, and more particularly to a lighting device that improves arousal level.

2. Description of the Related Art Conventionally, lighting devices that improve comfort and workability depending on the lighting environment have been proposed.
For example, in Japanese Patent Application Laid-Open No. 2007-329100, a main light source that mainly irradiates white light and a single wavelength light source that irradiates single wavelength light are provided. A technique for improving a worker's arousal level by exposing single wavelength light is disclosed. At that time, the illuminance of the single wavelength light is set so that the single wavelength light does not interfere with the operation under the ordinary white light illumination.

JP 2007-329100 A

  However, Japanese Patent Laid-Open No. 2007-329100 has a configuration in which white light and single wavelength light are turned on at the same time, and there is a problem that white light and single wavelength light are mixed and the effect of arousal level is diminished.

  It is also possible to increase the illuminance of single-wavelength light in order to enhance the awakening level effect, but in that case, in order to prevent the single-wavelength light from interfering with the work under white light illumination, The illuminance must also be increased, very large lighting energy is required, and eye fatigue may occur.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an illuminating device that can efficiently improve the arousal level.

An illuminating device according to an aspect of the present invention includes a main light source corresponding to a white light source, a sub light source corresponding to a blue light source, inducing awakening action, and a control device that controls the main light source and the sub light source. The control device operates the main light source and the sub light source in a complementary manner, and irradiates the sub light source intermittently so that the main light source is visually irradiated.

Good Mashiku is the spectral irradiance of the primary light source and the auxiliary light sources are set to the same value.

  A control device for an illumination device according to an aspect of the present invention operates a sub light source intermittently so that the main light source and the sub light source operate in a complementary manner and the main light source is visually irradiated. It is possible to increase the illuminance of the sub-light source while maintaining the illuminance of the main light source without being conscious of the irradiation of the light source, and it is possible to efficiently improve the arousal level.

It is an external appearance block diagram of the illuminating device 1 according to embodiment of this invention. It is a figure explaining the structure inside the illuminating device 1 according to embodiment of this invention. It is a figure explaining the experimental apparatus for experimenting the system of the illuminating device according to embodiment of this invention. It is a figure explaining the system of irradiation of the white light of the illuminating device according to embodiment of this invention, and blue light. It is a table figure explaining the irradiation conditions experimented with the experimental apparatus according to embodiment of this invention. It is a figure explaining the statistical result of the pupil diameter variation | change_quantity of each condition by the experimental apparatus which tests the system of the illuminating device according to embodiment of this invention. It is a figure explaining the electroencephalogram alpha wave attenuation coefficient variation | change_quantity in the predetermined conditions using the illuminating device according to embodiment of this invention. It is a figure explaining the subjective evaluation by VAS (Visual analogue scale) method about the irradiation system of the illuminating device according to embodiment of this invention. It is a figure explaining the statistical result of the subjective evaluation of each condition based on the VAS method of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

FIG. 1 is an external configuration diagram of lighting apparatus 1 according to the embodiment of the present invention.
Referring to FIG. 1, illumination device 1 according to the embodiment of the present invention includes a white light source 2 that can emit white light as a main light source, and a blue light source that can emit blue light as a sub-light source. 3 is included. In this example, a configuration in which a plurality of white light sources 2 and blue light sources 3 are provided has been described. However, the number is not particularly limited, and a configuration of one by one is also possible.

  As the white light source 2, it is possible to use a white LED that can be turned on / off (lighted / extinguished) at high speed. Further, as the blue light source 3, it is possible to use a blue LED that can be turned on / off at high speed (turned on / off). These light sources are arranged alternately so that light emission unevenness is reduced during either lighting.

FIG. 2 is a diagram illustrating an internal configuration of lighting apparatus 1 according to the embodiment of the present invention.
Referring to FIG. 2, lighting device 1 according to the embodiment of the present invention includes a light emitting unit 300 configured by a plurality of light emitting elements, a drive circuit 100 that drives the light emitting unit, and a controller that controls the entire lighting device 1. 200.

  The light emitting unit 300 includes terminals P1 to P5, a plurality of blue light sources (blue LEDs) 3, a plurality of white light sources (white LEDs) 2, switch elements SW1 and SW2, and a plurality of resistance elements R1 and R2. .

  Node N0 is electrically connected to voltage V1 through terminal P1. The resistance element R1 and the white light source 2 constituting each set are connected in series, and are connected between the node N0 and the node N1. Each of the plurality of sets including the plurality of resistance elements R1 and the plurality of white light sources 2 is connected in parallel between the node N0 and the node N1. Node N1 is electrically connected to terminal P5 connected to ground voltage GND through switch SW1. The gate of the switch SW1 receives an input of the pulse signal PWM1 through the terminal P2.

  As an example, the switches SW1 and SW2 are assumed to use MOS transistors that can be switched at high speed.

  Node N2 is electrically connected to voltage V2 through terminal P3. The resistance element R2 and the white light source 2 constituting each set are connected in series, and are connected between the node N2 and the node N3. In addition, each of the plurality of sets including the plurality of resistance elements R2 and the plurality of white light sources 2 is connected in parallel between the node N2 and the node N3. Node N3 is electrically connected to terminal P5 connected to ground voltage GND via switch SW2. The gate of the switch SW2 receives the input of the pulse signal PWM2 via the terminal P4.

  Drive circuit 100 receives instructions from controller 200 and outputs pulse signals PWM1 and PWM2. The pulse signals PWM1 and PWM2 are set to signals for turning on and off the switches SW1 and SW2 in a complementary manner. Specifically, the switch SW2 is off while the switch SW1 is on, and the switch SW1 is off while the switch SW2 is on.

  In this example, the white light source 2 is used as a main light source, and the blue light source 3 is used as a sub light source.

  For example, the switch SW1 is turned off, the switch SW2 is turned on, and the switch SW is turned on / off for an extremely short time of 200 ns as an example. Can be turned on alternately.

  The illuminance during the light emission period can be set independently for each of white light and blue light. The illuminance of white light can be set according to the voltage level of the voltage V1, and the illuminance of blue light can be set according to the voltage level of the voltage V2. Is possible. As an example, in this example, the voltages V1 and V2 are both set to 5V.

  The wavelength of the blue light source in this example is about 420 to 480 nm.

  FIG. 3 is a diagram for explaining an experimental apparatus for experimenting with a method of the illumination apparatus according to the embodiment of the present invention.

FIG. 3A is a view of the experimental apparatus as viewed from above.
The subject puts his / her chin on a pedestal, which is a pupil measurement device, and observes the pupil diameter of the subject in a resting state in which the light of the illumination device is projected onto the screen. A circular screen (diameter 500 mm) was prepared. The gaze distance from the subject to the circular screen is 500 mm. In addition, the pupil diameter of the subject was measured with a camera (eye mark recorder (EMR8 manufactured by Nack)) provided on the chin rest.

  The experimental apparatus is provided with a lighting device 1 as shown in FIG. 1 composed of a blue light source (blue LED) and a white light source (white LED) on one side and the other side on the back side of the subject, respectively, on a circular screen. It is set as the structure which irradiates. The distance between the LEDs was 1000 mm.

  The linear distance to the wall on which the LED and the circular screen were provided was 1000 mm. The blue LED and the white LED are inclined so as to be focused on the center of the circular screen.

  A halogen lamp was provided between the LEDs. The halogen lamp was the reference light and was used to refresh the subject's eyes.

  And it experimented on the several conditions mentioned later about the some test subject using the said experimental apparatus.

FIG. 3B is a diagram of the experimental apparatus viewed from the side.
As shown in FIG. 3B, the gaze distance from the subject to the circular screen is 500 mm.

The diameter of the circular screen was 500 mm, and the viewing angle was 53.1 deg.
The subject statically observed a circular screen under each condition light described later for approximately 10 minutes, and measured changes in pupil diameter and brain waves at that time, thereby inducing arousal action and evaluating physiological responses to blue light. Carried out.

  The correlation between changes in pupil diameter and wakefulness is shown in "Physiological responses to light exposure to a single wavelength (Japanese Journal of Physiological Anthropology Vol.13, No.2, p75-83, 2008-05-25)" In blue light, a significant change is observed in the pupil diameter and brain wave of the subject, and it is shown that the arousal level improves according to the change.

  FIG. 4 is a diagram illustrating a method of irradiating white light and blue light of the illumination device according to the embodiment of the present invention.

FIG. 4A shows a method of irradiating white light and blue light in a complementary manner in the illumination device according to the embodiment of the present invention. That is, there is no period in which both white light and blue light are irradiated, and only one of them is irradiated. Specifically, white light as a main light source is mainly irradiated, and blue light as a sub light source is irradiated intermittently instead of the main light source. Here, the case where white light and blue light are irradiated as complementary pulsed light is shown. Specifically, the period of white light is 900 μs, the spectral irradiance is 50 μW / cm ² (about 150 Lx), blue A case is shown in which irradiation is performed at a light period of 100 μs and a spectral irradiance of 50 μW / cm ² (about 30 Lx).

FIG. 4B shows an example of an irradiation method in a conventional lighting device as a comparative example. Conventionally, it is a method of irradiating blue light while irradiating white light. Specifically, the spectral irradiance 45μW / cm ² of white light, is when irradiated with spectral irradiance 5 W / cm ² of blue light is shown.

  FIG. 5 is a table for explaining the irradiation conditions used in the experimental apparatus according to the embodiment of the present invention.

  Referring to FIG. 5, here, five conditions of condition names “F10”, “P0”, “P1”, “P10”, and “P100” are shown.

Specifically, the condition “P100” is a case where only blue light is irradiated as continuous light and irradiation is performed with a spectral irradiance of 50 μW / cm ² of blue light.

The condition “P10” is set such that the duty ratio of blue light is “10%” (pulse width 100 μs) and the duty ratio of white light is “90%” (pulse width 900 μs) with a period of 1 ms (frequency 1000 Hz) as pulse light. This is the case of irradiation. The spectral irradiance is applied at 50 μW / cm ² for both blue light and white light.

The condition “P1” is set such that the duty ratio of blue light is “1%” (pulse width 100 μs) and the duty ratio of white light is “99%” (pulse width 9900 μs) with a period of 10 ms (frequency 100 Hz) as pulse light. This is the case of irradiation. The spectral irradiance is applied at 50 μW / cm ² for both blue light and white light.

The condition “P0” is a case where only white light is irradiated as continuous light and irradiation is performed with a spectral irradiance of white light of 50 μW / cm ² .

Conditions "F10" are spectral irradiance 45μW / cm ² of white light as a continuous light as the conventional method of Comparative Example is the equivalent energy condition "P10", is irradiated with spectral irradiance 5 W / cm ² of blue light Is the case.

  FIG. 6 is a diagram illustrating a statistical result of the pupil diameter change amount of each condition by an experimental device that tests the method of the illumination device according to the embodiment of the present invention.

  With reference to FIG. 6, the statistical result of each condition and the variation | change_quantity of a pupil diameter is shown about several test subjects.

  Specifically, the statistical results of the amount of change in pupil diameter for the conditions “P0”, “P1”, “P10”, “P100”, and “F10” are shown. In addition, the statistical result at the time of exposing on each condition for 3 to 6 minutes as an example is shown here.

  As shown in FIG. 6, the conditions “P0”, “P1”, “P10”, “P100”, and the case where the change in pupil diameter increases as the ratio of blue light irradiation increases. .

  In other words, it was confirmed that the pupil diameter changes more greatly as the ratio of blue light irradiation increases and is influenced by blue light.

  Further, as shown in FIG. 6, for example, when the conditions “P10” and “F10” are compared, it is confirmed that the condition “P10” has a larger pupil diameter change and is influenced by blue light. did.

  In addition, about the said statistical result, P value which is what is called a risk factor by the Holm method (Holm) was calculated | required. The P values of the conditions “P100”, “P0”, “P1”, “P10”, and “F10” were “P <0.01”. The P values of the conditions “P0” and “P10” were “P <0.05”. Further, a P value, which is a so-called risk factor, was determined by Dunnett's method. The P values of the conditions “P0” and “P10” were “P <0.05”. The P values of the conditions “P0” and “P100” were “P <0.1”. Therefore, it was confirmed that the risk factor was small and significant.

  FIG. 7 is a diagram for explaining an electroencephalogram α-wave attenuation coefficient change amount under a predetermined condition using the illumination device according to the embodiment of the present invention.

  Referring to FIG. 7, here, an amount of change in electroencephalogram α-wave attenuation coefficient (AAC (Alpha Attenuation Coefficient)) in comparison between conditions “P10” and “F10” is shown. Here, as an example, in the case of exposure under each condition for 9 minutes, the electroencephalogram α-wave attenuation coefficient (AAC) at the time of halogen lamp irradiation (at the time of resetting, ie, before exposure to conditional light), and the electroencephalogram after exposure to conditional light for 9 minutes The amount of change in the α wave attenuation coefficient (AAC) was measured.

  The electroencephalogram α wave attenuation coefficient (AAC) is for comparing the α wave intensity between when the eyes are open and when the eyes are closed, and is calculated by the following equation.

Electroencephalogram α wave attenuation coefficient = α wave intensity when eyes are closed / α wave intensity when eyes are open As shown in FIG. 7, when conditions “P10” and “F10” are compared, condition “P10” attenuates electroencephalogram α waves. It was confirmed that the amount of change in coefficient (AAC) was large and the arousal level was improved. In addition, about the said statistical result, the risk factor P value by what is called a t test was calculated | required. The P values of the conditions “P10” and “F10” were “P <0.01”. Therefore, it was confirmed that the risk factor was small and significant.

  Therefore, by irradiating white light and blue light, which are illumination methods of the illumination device according to the embodiment of the present invention, in a complementary manner, white light and continuous light that are illumination methods of the conventional illumination device as a comparative example The arousal level is improved compared to the blue light irradiation.

  FIG. 8 is a diagram for explaining subjective evaluation by the VAS (Visual analogue scale) method for the illumination method of the illumination device according to the embodiment of the present invention.

  Referring to FIG. 8, here, a case where subjective evaluation is possible on a scale of “0 to 100” regarding “redness”, “blueness”, “flickering”, and “discomfort” is shown.

By the VAS method, it is possible to obtain subjective evaluation statistics for each condition.
FIG. 9 is a diagram for explaining a statistical result of subjective evaluation of each condition based on the VAS method of FIG.

  Referring to FIG. 9, statistical results for each condition are shown for each of “redness”, “blueness”, “flicker”, and “discomfort”. As each condition, cases of conditions “P0”, “P1”, “P10”, and “P100” are shown.

FIG. 9A shows a statistical result of subjective evaluation for each “redness” condition.
FIG. 9B shows a statistical result of subjective evaluation for each condition of “blueness”.

  FIG. 9C shows the statistical result of subjective evaluation for each condition of “flicker”.

  FIG. 9D shows the statistical result of subjective evaluation for each condition of “discomfort”.

  As shown here, in the case of the condition “P100”, the values may be greatly different from other conditions, but the conditions “P1” and “P10” are approximately the same as the condition “P0”.

  The discomfort is particularly low for conditions “P1” and “P10” together with “P0”. Subjectively, there is no particular change from the normal condition “P0”, and a visually white light source is irradiated. As you can see, it is understood. That is, for example, it was confirmed that the subject does not feel uncomfortable when the illumination method using the illumination device using the condition “P10” is executed.

  Therefore, for example, with respect to the lighting device 1 according to the embodiment of the present invention, the wakefulness level is improved by executing the irradiation method according to the condition “P10” by the pulse signals PWM1 and PWM2 from the drive circuit 100 according to the instruction from the controller 200 It becomes possible to make it. In particular, in this example, as described above, it is a method of irradiating white light and blue light in a complementary manner, and it is not necessary to increase the illuminance of white light in order to increase the illuminance of blue light as in the conventional example, It is possible to irradiate blue light with the same illuminance while maintaining a state where the spectral irradiance of white light is low without giving a sense of incongruity to humans, so that the level of arousal can be improved efficiently. It becomes possible.

  Note that the condition “P10” is an example, and the closer to the condition “P100”, the more awakening level can be expected. However, the closer to the condition “P100”, the more the person feels uncomfortable. It is possible to set an appropriate value so as not to cause a sense of incongruity.

  In addition, although the case where LED was used as a light source was demonstrated in the above, it is not restricted to LED in particular, For example, it can also be set as the structure irradiated according to the same system using organic EL (Electro Luminescence) etc., for example.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1 lighting device, 2 white light source, 3 blue light source, 100 driving circuit, 200 controller.

Claims (2)

A main light source equivalent to a white light source;
A secondary light source that corresponds to a blue light source and induces an arousal action;
A control device for controlling the main light source and the sub light source,
The controller is
An illumination device that operates the main light source and the sub light source in a complementary manner and irradiates the sub light source intermittently so that the main light source is visually irradiated. The illumination device according to claim 1 , wherein spectral irradiances of the main light source and the sub light source are set to the same value.

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